Angle lock end folder

ABSTRACT

A mailing folder for a heavy object such as a book of great thickness is formed from a cut and scored blank of paper board folded into position to provide a pair of opposite protective cells for ends of the book. The folder comprises a plurality of rectangularly shaped panels connected to define a tube, and cell forming elements extend from opposite ends of a main panel thereof and are foldably connected to each other and to the main panel to enclose opposite ends of the book. Each of the cell forming elements comprises first and second spaced outer flap elements foldable to an inclined upright position with an inner flap element foldably connected to the first and second flap elements at a distal flap edge thereof and foldable to a vertical position with the distal edge bearing against the main panel. A central reinforcing element extends between the first and second outer flap elements and is foldably connected at its ends to the main panel and the inner flap element, the central element having first and second portions additionally defined by spaced edges in the first and second outer flap elements and in the main panel, the central reinforcing element being folded upon folding of the first and second outer flap elements to a position where a portion thereof is braced against the first and second spaced flap elements. Closure elements extend from a top panel of the tube and are foldable to a position over the protective cell forming elements to provide a pair of oppositve protective cells for the book contained within the folder.

United States Patent Skaggs [451 Mar. 18, 1975 ANGLE LOCK END FOLDER[75] Inventor: Boyd T. Skaggs, Ravenna, Ohio [73] Assignee: ContainerCorporation of America,

Chicago, Ill.

22 Filed: Jan.2l, 1974 211 Appl.No.:434,883

Primary ExaminerEdward J. McCarthy Attorney, Agent, or FirmCarpenter,Ostis & Lindberg [57] ABSTRACT Amailing folder for a heavy object suchas a book of great thickness is formed from a cut and scored blank ofpaper board folded into position to provide a pair of oppositeprotective cells for ends of the book. The folder comprises a pluralityof rectangularly shaped panels connected to define a tube, and cellforming elements extend from opposite ends of a main panel thereof andare foldably connected to each other and to-the main panel to encloseopposite ends of the book. Each of the cell forming elements comprisesfirst and second spaced outer flap elements foldable to an inclinedupright position with an inner flap element foldably connected to thefirst and second flap elements at a distal flap edge thereof andfoldable to a vertical position with the distal edge bearing against themain panel. A central reinforcing element extends between the first andsecond outer flap elements and is foldably connected at its ends to themain panel and the inner flap element, the central element having firstand second portions additionally defined by spaced edges in the firstand second outer flap elements and in the main panel, the centralreinforcing element being folded upon folding of the first and secondouter flap elements to a position where a portion thereof is bracedagainst the first and second spaced flap elements. Closure elementsextend from a top panel of the tube and are foldable to a position overthe protective cell forming elements to provide a pair of oppositveprotective cells for the book contained within the folder.

1 Claim, 5 Drawing Figures PATENTEBHAR I 81975 FIGJ FIGZ

ANGLE LOCK END FOLDER BACKGROUND OF THE INVENTION Class 229-40 RingholzClass 229-40 Partain et al The structure according to the presentinvention constitutes an improvement over the aforesaid prior artspatents in that a book of relatively great thickness can be moreefficiently and properly protected because of the particularconfiguration of protective cells provide for opposite ends of the book.The cells are characterized by spaced angularly positioned elementscausing a vertical element to bear against an edge of the book, theangularlypositioned elements being maintained in position by a centralelement which is contacted by closure elements for the protective cellforming elements to provide a cell of the opposite protective cells.

THE DRAWINGS FIG. 1 is a perspective view showing details of an improvedmailing folder constructed according to the teachings of thepresentinvention, certain parts being broken away;

FIG. 2 is a plan view of a cut and scored blank of paper board or thelike for constructing the folder seen in FIG. 1;

FIG. 3 is a plan view looking downward and taken along a plane beneaththe top cover panel of the folder;

FIG. 4 is a vertical sectional view taken substantially along the line4--4 of FIG. 3 looking in the direction of the arrows; and

FIG. 5 is a view looking in the direction of the arrows 55 of FIG. 4,certain parts are being broken away to show details of construction.

The improved mailing folder according to the present invention isdenoted generally by the reference numeral and is formed from a cut andscored blank 10A seen in FIG. 2. As seen in FIG. 2, blank 10A comprisesrectangularly shaped main, first side, top and opposite side panelsdenoted respectively by the reference numerals ll, 12, 13 and 14, thesepanels being foldably connected together along fold lines 16 and forminga tube. Closure flap 17 is foldably connected to opposite side panel 14along a fold line 18, and is connected to the main panel 11, there beinga lift tab 19 foldably connected to closure flap 17 along a score line21.

Protective cell forming elements are referred to generally by referencenumeral 20, and extended from opposite ends of the main panel 11, andare foldably connected to each other and to the main panel 11 and foldable to positions to enclose opposite ends of a book, not shown.Protective cell forming elements 20 comprise respective spaced first andsecond flanking flap elements 22 and 23 foldably connected to the mainpanel 11 along a fold line 24. An inner flap element 26 is foldablyconnected to the first and second flanking flap elements 22 and 23 at adistal edge 27 thereof, and is foldable to a vertical position with thedistal edge of inner flap element 26 bearing against main panel 11. Inthe folding of the inner flap element 26 to the vertical position thefirst and second flap elements 22 and 23 adopt an inclined uprightposition as seen more clearly in FIGS. 1 and 4.

A central reinforcing element indicated generally by reference numeral25 extends between the first and second flap elements 22 and 23 and isfoldably connected at its inner end along a score line 28 to the mainpanel 11 and to the inner flap element 26 along score line 27. Centralreinforcing element 25 comprises first and second portions referred torespectively by reference numerals 29 and 31, these portions beingfoldably connected alonga fold line 33. Central reinforcing element 25is additionally defined by partly converging spaced edges 36 in thefirst and second outer flap ele ments 22 and 23, and by spaced edges 37.In the forming of the central reinforcing element 25, portions of theouter flap elements 22 and 23 cut out as seen particularly in FIG. 2,and provide shoulders 25A and 25B. Shoulder 25A is formed in centralelement 25, and shoulder 25B is formed in flap elements 22 and 23. Inthe folding of the protective cell forming element 20 centralreinforcing element 25 is caused to bear against the first and secondspaced outer flap elements 22 and 23 as seen particularly in FIGS. 1 and4.

In the folding of the central reinforcing element 25, element 29 thereofadopts an horizontal position as seen in FIGS. 1 and 4. Top panel 13 isprovided with closure elements 41 foldably connected to the top panel 13along a fold line 42, and a closure element 43 foldably connected toclosure element 41 along a fold line 44. When the closure elements 41and 43 and brought into the closing position flap 41 bears against thefold line 33 between reinforcing element 25 and portion 29.

When the folding and erection operation is completed the shoulders 25Aon central element 25 are in abutting relationship with the underside offlanking elements 22 and 23, element 25 adopting the inclined positionshown and providing an effective cell brace with elements 22 and 23.

I claim:

1. A mailing folder for a heavy object such as a book of greatthickness, said folder being formed from a cut and scored blank of paperboard or the like and folded into position so as to provide opposed andbraced end protective cells for opposite ends of said book, said foldercomprising:

a. rectangularly shaped main, first side, top and opposite side panelconnected along fold lines and folded to define a tube;

b. protective cell forming elements extending from opposed ends of saidmain panel foldably connected to each other and to said main panel andfoldable to position to enclose opposite ends of said book, saidelements each comprising:

i. first and second spaced flanking flap elements foldably connected tosaid main panel and foldable to an inclined upright position;

ii. an inner flap element foldably connected to said flanking flap andfoldable to a vertical position with the distal edge thereof bearingagainst said main panel;

v. said central reinforcing element being folded upon folding of saidfirst and second flanking flap elements to an inclined position.

c. closure elements extending from said top panel and foldable to aposition over said protective cell forming elements to provide a pair ofopposed protective cells.

1. A mailing folder for a heavy object such as a book of greatthickness, said folder being formed from a cut and scored blank of paperboard or the like and folded into position so as to provide opposed andbraced end protective cells for opposite ends of said book, said foldercomprising: a. rectangularly shaped main, first side, top and oppositeside panel connected along fold lines and folded to define a tube; b.protective cell forming elements extending from opposed ends of saidmain panel foldably connected to each other and to said main panel andfoldable to position to Enclose opposite ends of said book, saidelements each comprising: i. first and second spaced flanking flapelements foldably connected to said main panel and foldable to aninclined upright position; ii. an inner flap element foldably connectedto said flanking flap and foldable to a vertical position with thedistal edge thereof bearing against said main panel; iii. a centralreinforcing element extending between said first and second flankingelements and foldably connected at its ends to said main panel and saidinner panel; iv. said central reinforcing element comprising first andsecond portions additionally defined by spaced edges in said first andsecond flanking flap elements and in said main panel; v. said centralreinforcing element being folded upon folding of said first and secondflanking flap elements to an inclined position. c. closure elementsextending from said top panel and foldable to a position over saidprotective cell forming elements to provide a pair of opposed protectivecells.